The paper

Searches for B mesons decaying to final states containing a baryon and a lepton are performed, where the baryon is either Λc or Λ and the lepton is a muon or an electron. These decays violate both baryon and lepton number and would be a signature of physics beyond the standard model. No significant signal is observed in any of the decay modes, and upper limits in the range are set on the branching fractions at the 90% confidence level.

References for the interested reader

Physics background

Baryon asymmetry

From the paper:

Observations show that the universe
contains much more matter than antimatter (Coppi, Steigman:1976ev).
This suggests that there are processes that violate CP-symmetry
and baryon-number conservation (Sakharov).
However, experimentally observed CP violation,
combined with the baryon-number violating
processes that are allowed by the standard model (Kuzmin),
cannot explain the observed matter-antimatter asymmetry.

This is generally considered the canonical paper that established the three ``Sakarov conditions", necessary to explain the baryon asymmetry of the universe.

This paper is pitched at a higher level and may not be terribly enlightening to non-graduate-level experts and up. Having said that, it is referenced so often that it is worth reading through at least once.

Particles

While this is not a comprehensive list, this analysis primarily made use of the following particles. I have provided links to the relevant PDG pages that detail the properties of these particles.

It is not necessary to know everything about these states, but familiarizing yourself with the masses and quark content (where applicable) will give you more intuition for these processes.